Weather is far too cold this time of year in South Dakota to be enjoyable for warm weather travelers. The average high during this season is between 35.6°F (2°C) and 29.4°F (-1.4°C). 2020 Long Range Weather Forecast for Custer, SD ... September and October will have above-normal temperatures and below-normal precipitation. The variety of trees in South Dakota become color-changing canvases in the autumn. The number of days with any measurable precipitation is 83. About the High Plains Region. Custer September weather guide. Custer Extended Forecast with high and low temperatures. The annual rainfall of 19.9 inches in Custer means that it is drier than most places in South Dakota. On average, it rains or snows a smalll amount: 1 to 2 times per month. Check temperature, rainfall & sunshine averages & more in September 2021 in Custer, South Dakota - USA Summer low temps in the 40s are common. Custer Weather Forecasts. Yes. °F. Visitors make foliage pilgrimages to places like Spearfish Canyon and Sica Hollow State Park to take in the gorgeous transition. The US average is 37. Showing: All Year January February March April May June July August September October November December Weather Underground provides local & long-range weather forecasts, weatherreports, maps & tropical weather conditions for the Custer area. Weather conditions with updates on temperature, humidity, wind speed, snow, pressure, etc. Based on weather reports collected during 1985–2015. On average, there are 226 sunny days per year in Custer, South Dakota. for Custer, South Dakota Average Weather in Custer South Dakota, United States. FALL. March is the rainiest month in Maryville with 12.1 days of rain, and September is the driest month with only 8.0 rainy days. Custer, SD - Weather forecast from Theweather.com. Bring long pants. You see lots of "Custer State Park" sweatshirts around the Midwest because people come with clothes that are too light and end up buying heavier clothes. Last 2 weeks of weather In Custer, the summers are warm and mostly clear and the winters are long, freezing, dry, and partly cloudy. Ellsworth Air Force Base is 36 miles from Custer, so the actual climate in Custer can vary a bit. It is likely that you'll need them in the Black Hills at night. The average US city gets 25 inches of snow per year. Fall weather tends to be mild with an average daytime high of 57°F (14°C) and low of 44°F (7°C), although temperatures and precipitation can vary. Custer, South Dakota, gets 19 inches of rain per year. Snowfall is 49 inches. Maryville with 12.1 days of rain per year with 12.1 days of rain, partly... Snow per year in South Dakota United States month with only 8.0 rainy days the average US city 25. 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